Improve Mihomo Control customization and group ordering

[mdj2812]

Plugin

• Id: mdj2812/mihomo-control
• New plugin
• Update to an existing plugin (version bumped in plugin.toml)

What it does

Expands Mihomo Control's presentation and proxy-group management:

• Persists a user-defined proxy-group display order and supports drag reordering.
• Offers floating or bar-attached control-panel placement.
• Replaces status PNG variants with a compact, tintable glyph traced from the bundled Mihomo logo.
• Adds widget settings for icon size, status/custom colors, and selectable labels: icon-only, mode, traffic rates, connection count, first-group proxy, or first-group latency.
• Enlarges drag-only insertion targets, lifts the complete source slot, and previews the destination gap before drop.

External dependencies

None. The plugin talks only to the configured Mihomo external-controller HTTP API. The optional glyph generator has development-only OpenCV/fontTools dependencies; its SVG and TTF outputs are committed and no generator dependency is needed at runtime.

Testing

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Tested on another compositor:
• Noctalia version tested against: noctalia v5.0.0 (v5.0.0-beta.8-50-g713e6caa3ac6)
• Plugin API level: 9

Screenshots / Videos

TODO: attach compact widget, custom glyph/color, both panel placements, and drag-preview screenshots before marking ready.

Checklist

• The directory name matches the part of id after the / in plugin.toml exactly.
• It ships plugin.toml, README.md, thumbnail.webp, and translations/en.json.
• README.md follows the
  README template, documents
  every entry id and dependency, and includes exact panel IPC commands and launcher prefixes where applicable.
• I created thumbnail.webp with the thumbnail generator.
• version follows semver and is bumped in this PR; plugin_api is the oldest API level this plugin requires.
• Every non-English translation in this PR uses a locale supported by Noctalia core, and I can read, write, and
  understand that language well enough to review and maintain it (no unreviewed machine/LLM translations).
• I did not edit catalog.toml; CI generates it.
• This PR touches exactly one plugin directory.

Code review attestation

Plugins run as trusted, unsandboxed Luau in the user's session. Confirm:

• The code is readable and not obfuscated, minified, or generated.
• It does not download and execute remote code.
• Every network call, filesystem write, and spawned process is something the description above accounts for.
• I have the right to publish this code under the license declared in plugin.toml.

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